4. Telephonic communications
  5. Special services
  6. Call diversion

Roger P. Engdahl

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Automatic safety shutoff valve

Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent

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Automatic safety shutoff valve

Valves and valve actuation – Permanent or constantly energized magnet actuator
Patent

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Enhanced overflow call processing

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Reexamination Certificate

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Intergrating, indicating, and controlling seismometer

Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Patent

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Seismic displacement recorder for base-isolated structures

Recorders – Record tracer movement responsive to inertia or mass...
Patent

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Profile ID: LFUS-PAI-P-776335

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